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Related Flashcards
Cards In This Set
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Engineering stress
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Sigma=F/Ao
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Engineering strain
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E=(L-Lo)/Lo
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Modulus of Elasticity
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E=sigma/e
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Yeild point
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 A strength characteristic of the material, aka yeild strength |
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Tensile strength
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Top of plastic portion of curveTS=Fmax/Ao
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Necking
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The portion of the elastic curve to the right of TS.
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Ductility
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The amount of strain that a material can endure before failure. The ability to plastically strain without fracture. Can be calculated with elongation or area reduction.
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True stress-strain
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If actual (instantaneous) area (for stress) or length(for strain) that becomes increasingly smaller as the test proceeds
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Toughness
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The ability of material to absorb energy. Roughtly the area under the stress/strain curve
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Work hardening
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AKA strain hardening, the metal becomes stronger as the strain increases
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What happens when true stress strain of the plastic region of the curve is plotted against log-log time
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It has a linear relationship
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Hardness
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Resistance to permanent indentation. Resistant to scratching. Strong correlation between hardness and strength.
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If you just consider density and strength, what material is preferrable over what?
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Aluminum is prefferable, however, iron and steel are less expensive.
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List five metals in order of strength
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Aluminum, aluminum alloys, cast iron, steel, titanium alloys
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As steel strength increases
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Castability, weldability, formatbility, machinability, manufacturability all decrease.
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